cpanel email backup server

Hello,

I have some doubt, wait that you can clear about it, this is the situation:

i have a whm server with shared hosting, we want to create a new mx secondary for relay, antispam and antivirus, i would like to know about the values of mx and priorities.

if in other server i create the same account as the first server but as backup email server.

then i configure as mx

0 mx first server
10 mx first server

in the case the email arrive first to the second server, when keep in the queue, this emails also filtrered by spamassassin, RBL set and the other rules configured in the second server? or just queue the email for then deliver to the main email server?

Thank you.

 

of the same way work in case of use cpanel/dnsonly?

thank you.